code: def test_invalid_key_in_state_mapping(self):
      # var1 = backend.Variable(np.zeros((2,)))
      invalid_key = "not_a_keras_variable"
      value1 = ops.ones(shape=(2,))
  
      with self.assertRaisesRegex(
          ValueError,
          "all keys in argument `mapping` must be KerasVariable",
      ):
          StatelessScope(state_mapping=[(invalid_key, value1)])
  
file_path: keras/keras/backend/common/stateless_scope_test.py
imports: import numpy
  from keras import backend
  from keras import ops
  from keras import testing
  from keras.backend.common.stateless_scope import StatelessScope
label_desc: Use image node_id 2 for calling the TestStatelessScope obj's underlying member method code with example usage: obj.test_invalid_key_in_state_mapping() without return types